End of handle is marked to quickly identify tool. The following replacement bits are available: see Cat. No. 32478 (Num.1 Phillips & 3/16in Slotted) and Cat. No. 32479 ( Num.2 Phillips & 9/32in Slotted). Features 5/16in nut driver- Num.1 and Num.2 Phillips- 9/32in Slotted and 3/16in slotted.